Load Specifications
Load data in caliber .300 H&H Mag. with .311 | 190gr | Prvi Partizan FMJ BT bullet and 95 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Accurate High Country.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,752 psi | 88% | 2618 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,956 psi | 90% | 2687 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,403 psi | 86% | 2730 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 55,056 psi | 88% | 2671 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,637 psi | 89% | 2776 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 54,360 psi | 87% | 2864 fps | 97.5% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,434 psi | 89% | 2867 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 86% | 55,129 psi | 88% | 2700 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,055 psi | 85% | 2762 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,157 psi | 87% | 2812 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,433 psi | 87% | 2818 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 53,200 psi | 85% | 2762 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,014 psi | 90% | 2726 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,246 psi | 90% | 2746 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,333 psi | 90% | 2828 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,853 psi | 86% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,811 psi | 89% | 2805 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,982 psi | 85% | 2808 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,082 psi | 80% | 2746 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,598 psi | 70% | 2674 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,447 psi | 86% | 2877 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,762 psi | 78% | 2736 fps | 97.3% |
| Bofors RP3 | <<locked>> | 84% | 53,272 psi | 85% | 2690 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,982 psi | 85% | 2808 fps | 98.2% |
| Bofors RP7 | <<locked>> | 90% | 56,057 psi | 90% | 2726 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 53,577 psi | 86% | 2707 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,317 psi | 87% | 2776 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 88% | 54,244 psi | 87% | 2736 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 98% | 54,418 psi | 87% | 2759 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,388 psi | 86% | 2743 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 53,185 psi | 85% | 2707 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,810 psi | 88% | 2740 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,815 psi | 69% | 2703 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 90% | 54,157 psi | 87% | 2808 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 58% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,521 psi | 89% | 2703 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,665 psi | 88% | 2684 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,882 psi | 86% | 2671 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 53,621 psi | 86% | 2710 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,389 psi | 87% | 2703 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 56,130 psi | 90% | 2769 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,070 psi | 87% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,159 psi | 90% | 2749 fps | 96.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,677 psi | 83% | 2785 fps | 96.6% |
| Lovex S060 | <<locked>> | 82% | 56,231 psi | 90% | 2671 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,810 psi | 88% | 2677 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,360 psi | 87% | 2700 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 55,825 psi | 90% | 2743 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,440 psi | 71% | 2589 fps | 98.6% |
| Norma 201 | <<locked>> | 82% | 56,188 psi | 90% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,535 psi | 89% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,215 psi | 87% | 2759 fps | 98% |
| Norma MRP | <<locked>> | 98% | 52,489 psi | 84% | 2835 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 54,520 psi | 87% | 2762 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,188 psi | 90% | 2759 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,054 psi | 83% | 2802 fps | 97% |
| Ramshot Hunter | <<locked>> | 92% | 53,200 psi | 85% | 2766 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,340 psi | 74% | 2680 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 59% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,621 psi | 86% | 2694 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,476 psi | 86% | 2792 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,405 psi | 89% | 2799 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,896 psi | 86% | 2825 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,627 psi | 68% | 2694 fps | 97.5% |
| Rottweil R 902 | <<locked>> | 82% | 53,490 psi | 86% | 2644 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 53,388 psi | 86% | 2687 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,694 psi | 88% | 2736 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 98% | 55,071 psi | 88% | 2792 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 90% | 56,057 psi | 90% | 2726 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,360 psi | 87% | 2700 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 54,810 psi | 88% | 2677 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,825 psi | 90% | 2743 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,955 psi | 88% | 2746 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,782 psi | 89% | 2717 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,578 psi | 88% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,070 psi | 87% | 2654 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,592 psi | 88% | 2789 fps | 98.4% |
| Somchem S355 | <<locked>> | 86% | 53,505 psi | 86% | 2684 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 52,968 psi | 85% | 2680 fps | 96% |
| Somchem S365 | <<locked>> | 94% | 53,708 psi | 86% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,927 psi | 90% | 2772 fps | 99.1% |
| Vihtavuori N135 | <<locked>> | 82% | 53,896 psi | 86% | 2605 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,012 psi | 87% | 2618 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,723 psi | 88% | 2664 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 53,069 psi | 85% | 2707 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,517 psi | 83% | 2694 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 84% | 55,521 psi | 89% | 2661 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,608 psi | 89% | 2762 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,275 psi | 90% | 2822 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 52,866 psi | 85% | 2822 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,130 psi | 90% | 2726 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,317 psi | 87% | 2776 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,237 psi | 73% | 2802 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,173 psi | 90% | 2726 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,130 psi | 90% | 2769 fps | 98.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 51,474 psi | 83% | 2575 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,023 psi | 79% | 2579 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 33,185 psi | 53% | 2359 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 48,747 psi | 78% | 2582 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,101 psi | 59% | 2457 fps | 98.3% |
| Accurate High Country | 65.5 gr | 92% | 44,266 psi | 71% | 2687 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 98% | 51,503 psi | 83% | 2802 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 46,035 psi | 74% | 2559 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 90% | 43,627 psi | 70% | 2598 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 96% | 47,529 psi | 76% | 2697 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,589 psi | 81% | 2762 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,075 psi | 66% | 2543 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,485 psi | 75% | 2582 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,647 psi | 80% | 2648 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,085 psi | 58% | 2464 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,843 psi | 65% | 2585 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,625 psi | 65% | 2539 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,698 psi | 65% | 2585 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,542 psi | 43% | 2234 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,850 psi | 51% | 2395 fps | 95.2% |
| Alliant Reloder-26 | 60.1 gr | 82% | 30,139 psi | 48% | 2392 fps | 95.4% |
| Bofors RP15 | <<locked>> | 96% | 42,859 psi | 69% | 2625 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 46,586 psi | 75% | 2589 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,698 psi | 65% | 2585 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 41,060 psi | 66% | 2467 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 46,963 psi | 75% | 2602 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 39,001 psi | 63% | 2500 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 41,829 psi | 67% | 2516 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 96% | 50,836 psi | 82% | 2703 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,893 psi | 80% | 2687 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,736 psi | 54% | 2365 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,329 psi | 82% | 2690 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,118 psi | 64% | 2638 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 37,913 psi | 61% | 2507 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 44% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,272 psi | 84% | 2657 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,399 psi | 78% | 2589 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,575 psi | 81% | 2618 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 39,218 psi | 63% | 2451 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,540 psi | 68% | 2497 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 35,621 psi | 57% | 2411 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 50,937 psi | 82% | 2674 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,647 psi | 80% | 2648 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 48,312 psi | 77% | 2723 fps | 95.7% |
| Lovex S060 | <<locked>> | 80% | 53,011 psi | 85% | 2625 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,602 psi | 78% | 2585 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,161 psi | 64% | 2454 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 38,392 psi | 62% | 2434 fps | 96.3% |
| Lovex S071 | <<locked>> | 90% | 32,198 psi | 52% | 2336 fps | 95% |
| Norma 201 | <<locked>> | 80% | 52,910 psi | 85% | 2644 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,008 psi | 79% | 2635 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,495 psi | 67% | 2536 fps | 95% |
| Norma MRP | <<locked>> | 88% | 37,289 psi | 60% | 2539 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 36,941 psi | 59% | 2454 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,124 psi | 79% | 2654 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 44,976 psi | 72% | 2674 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 35,665 psi | 57% | 2434 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 96% | 40,074 psi | 64% | 2556 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,659 psi | 44% | 1535 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,181 psi | 76% | 2589 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,395 psi | 70% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,796 psi | 59% | 2474 fps | 98% |
| ReloadSwiss RS 70 | 58.1 gr | 80% | 35,694 psi | 57% | 2477 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 36,956 psi | 59% | 2559 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 50,357 psi | 81% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,092 psi | 71% | 2543 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,295 psi | 73% | 2579 fps | 95% |
| Rottweil R 905 | <<locked>> | 90% | 42,337 psi | 68% | 2575 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 41,060 psi | 66% | 2467 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,161 psi | 64% | 2454 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 48,602 psi | 78% | 2585 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,392 psi | 62% | 2434 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,991 psi | 72% | 2592 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,388 psi | 84% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,339 psi | 73% | 2451 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,291 psi | 63% | 2402 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,945 psi | 67% | 2569 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 44,382 psi | 71% | 2539 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,458 psi | 79% | 2621 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 33,388 psi | 54% | 2411 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 37,797 psi | 61% | 2454 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 50,633 psi | 81% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,850 psi | 82% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,366 psi | 68% | 2474 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,348 psi | 61% | 2451 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 39,523 psi | 63% | 2484 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 48,907 psi | 78% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,637 psi | 60% | 2451 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 29,124 psi | 47% | 2306 fps | 96.3% |
| Vihtavuori N560 | <<locked>> | 96% | 49,472 psi | 79% | 2762 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,347 psi | 60% | 2421 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,001 psi | 63% | 2500 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,889 psi | 40% | 2254 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,460 psi | 84% | 2674 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,496 psi | 68% | 2546 fps | 95.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 95 powders for .300 H&H Mag. loaded with the .311 | 190gr | Prvi Partizan FMJ BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,877 fps; across all powders the maximum-charge window runs from 1,680 fps to 2,877 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 190.0 gr projectile in 0.311" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 70, Alliant Reloder-26, Accurate High Country rank at the top here: for .300 H&H Mag. with the .311 | 190gr | Prvi Partizan FMJ BT they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.